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Home >> Saturn >> 2001 >> SW2 L4-1.9L DOHC VIN 7 >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Description and Operation >> Output Speed Sensor (OSS)
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Output Speed Sensor (OSS)


OUTPUT SPEED SENSOR(OSS)





The Output Speed Sensor (OSS) produces an AC voltage of different amplitude and frequency depending on the velocity of the output shaft. The OSS produces the signal from 16 evenly spaced machined notches on the transaxle differential carrier. The OSS produces a readable AC voltage signal when vehicle speed is above 5 km/h (3 mph). This OSS signal is sent to the PCM, which is used to determine the velocity of the output shaft.
The PCM uses the OSS to monitor the speed of the output shaft. In conjunction with the ISS, the PCM can determine the slip across the commanded gear clutch pack. The PCM can use this information to determine the actual gear ratio, gear slippage or lack of main line hydraulic pressure.
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